package com.hmdp.utils;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.util.StrUtil;
import com.hmdp.dto.UserDTO;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Map;
import java.util.concurrent.TimeUnit;

public class RefreshTokenInterceptor implements HandlerInterceptor {
    //自定义拦截器，需要手动注入
    private StringRedisTemplate stringTemplate;

    public RefreshTokenInterceptor(StringRedisTemplate stringTemplate) {
        this.stringTemplate = stringTemplate;
    }

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        //为空放行到下一个拦截器
        String token = request.getHeader("authorization");
        if (StrUtil.isBlank(token)) {
            return true;
        }
        //TODO 基于token获取redis中的用户信息
        Map<Object, Object> userMap = stringTemplate.opsForHash()
                .entries(RedisConstants.LOGIN_USER_KEY + token);
        if (userMap.isEmpty()) {
            return true;
        }
        //TODO 将redis中的对象转化为userDTO对象
        UserDTO userDTO = BeanUtil.fillBeanWithMap(userMap, new UserDTO(), false);
        //TODO 如果存在，存入ThreadLocal中
        UserHolder.saveUser(userDTO);
        //TODO 刷新token过期时间
        stringTemplate.expire(RedisConstants.LOGIN_USER_KEY + token, RedisConstants.LOGIN_USER_TTL, TimeUnit.MINUTES);
        return true;
    }
    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        //移除用户
        UserHolder.removeUser();
    }
}
